I think this list is needed so that everyone knows what they're getting into against certain characters.
Needless to say, the glide is extremely important to Pit's recovery. Without it, Pit's recovery is very slow and gimpable. The huge priority of the glide attack is what gives Pit a safe way back.
So if someone can reliably stop that, then Pit needs to be very careful. If they can out-prioritize your glide attack, then they can out-prioritize ALL your aerials, and that will end up forcing a WoI on you.
So I think a list is in order and I will need your help with it since I just don't remember everything about every character, but I'll get it started. Not all of these are reliable ways to stop the glide attack, but one should at least be aware of them:
G&W - Fair, Bair, Nair from below, UpB
Meta Knight - Uair, UpB, NeutralB, SideB (Other aerials?)
Marth - Fair, UpB (Nair?)
Olimar - UpB (I have read that Olimar aerials with Blue Pikmin have high priority but haven't had the chance to test it out yet.)
R.O.B - Bair (Fair? Nair? Uair?)
Snake - (Bair?)
Ice Climbers - Uair, UpB (Bair?)
Ganondorf - UpB
Captain Falcon - UpB
Donkey Kong - NeutralB (UpB?)
Bowser - (SideB? UpB?)
Ike - Fair, Bair, Nair
Link - Uair, Zair (Fair? Nair?)
Toon Link - Uair, Zair (Fair? Bair? Nair?)
Zelda - Uair
Sheik - SideB (Bair? Nair?)
Mario - SideB
Samus - Zair
Ness - Fair
Charizard - Fair (Bair? UpB?)
Ivysaur - Bair, Fair, Uair, UpB
Squirtle - UpB
Yoshi - (Bair?)
ZSS - UpB, SideB (Nair?)
Ok, that's what I'm starting with. Some might be wrong, and some might have been forgotten.
I'm not including Dairs because they're not something anyone will use since it's just way too hard to get above a gliding returning Pit, especially if the Pit DI's the launching attack properly.
EDIT for clarification -
This is a list meant to help prevent getting gimped or forced into a dangerous WoI, so I'm only including attacks that can do that. Because of that, grounded attacks won't be included, because those attacks don't pose a threat to your recovery.
Also, projectiles will always stop you, so I don't think they need to be included, since that would be all of them. With good timing you can cancel out most projectiles (I believe lasers and breath attacks [IC's, Bowser, Charizard] are the only exceptions) with your Glair, but you'll still be left without your important glide for a safe return. So always be careful of projectiles. I might add an amendment to this list to include projectiles that pose the most threat (e.g. Zelda's).
Needless to say, the glide is extremely important to Pit's recovery. Without it, Pit's recovery is very slow and gimpable. The huge priority of the glide attack is what gives Pit a safe way back.
So if someone can reliably stop that, then Pit needs to be very careful. If they can out-prioritize your glide attack, then they can out-prioritize ALL your aerials, and that will end up forcing a WoI on you.
So I think a list is in order and I will need your help with it since I just don't remember everything about every character, but I'll get it started. Not all of these are reliable ways to stop the glide attack, but one should at least be aware of them:
G&W - Fair, Bair, Nair from below, UpB
Meta Knight - Uair, UpB, NeutralB, SideB (Other aerials?)
Marth - Fair, UpB (Nair?)
Olimar - UpB (I have read that Olimar aerials with Blue Pikmin have high priority but haven't had the chance to test it out yet.)
R.O.B - Bair (Fair? Nair? Uair?)
Snake - (Bair?)
Ice Climbers - Uair, UpB (Bair?)
Ganondorf - UpB
Captain Falcon - UpB
Donkey Kong - NeutralB (UpB?)
Bowser - (SideB? UpB?)
Ike - Fair, Bair, Nair
Link - Uair, Zair (Fair? Nair?)
Toon Link - Uair, Zair (Fair? Bair? Nair?)
Zelda - Uair
Sheik - SideB (Bair? Nair?)
Mario - SideB
Samus - Zair
Ness - Fair
Charizard - Fair (Bair? UpB?)
Ivysaur - Bair, Fair, Uair, UpB
Squirtle - UpB
Yoshi - (Bair?)
ZSS - UpB, SideB (Nair?)
Ok, that's what I'm starting with. Some might be wrong, and some might have been forgotten.
I'm not including Dairs because they're not something anyone will use since it's just way too hard to get above a gliding returning Pit, especially if the Pit DI's the launching attack properly.
EDIT for clarification -
This is a list meant to help prevent getting gimped or forced into a dangerous WoI, so I'm only including attacks that can do that. Because of that, grounded attacks won't be included, because those attacks don't pose a threat to your recovery.
Also, projectiles will always stop you, so I don't think they need to be included, since that would be all of them. With good timing you can cancel out most projectiles (I believe lasers and breath attacks [IC's, Bowser, Charizard] are the only exceptions) with your Glair, but you'll still be left without your important glide for a safe return. So always be careful of projectiles. I might add an amendment to this list to include projectiles that pose the most threat (e.g. Zelda's).