Pretty much the reason I've been distancing myself from speculation more and more.
Speculation starting out was full of many possibilities and being completely in the dark of what would happen next.
Now it's just trying to make sure no one flames you for having a differing opinion.
Funny enough, a few times when people were trying to make discussion less confrontational, I've seen it go in the other direction where you couldn't even be disappointed with a new character without being guilted from others ('Hey, don't knock character X as they have fans!')
Or suggesting a character would have a better chance of being playable at all if they were an echo instead of a semi clone or unique is treated like its a sin against the character's whole being.
Or merely questioning the logic of when certain characters were revealed by Nintendo's marketing (not even towards the character itself) was described as having blind rage and hate against a character.
Make no mistake, Smash seems to collect some awful people each cycle on various sites (Gamefaqs, IGN, etc). But I think the toxic accusation sometimes gets thrown around alittle too much to counter that awfulness.