The real question to ask isn't "Can you get grabbed", it's "Should you get grabbed?"
I can find videos where a player doesn't get grabbed a single time vs IC's, and I can find videos where a player loses all 3 stocks 0-death and gets 3 stocked. The Question you need to ask is Whether the person SHOULD have gotten grabbed or not.
Getting grabbed by IC's can happen. Humans aren't perfect, we don't always avoid things. However, it's not CAN they grab you, but whether you SHOULD be getting grabbed by them. The better characters SHOULD NOT be getting grabbed by them, but are because people aren't perfect or don't always play as gay as possible or don't understand how to do so in the first place.
Take that match on Battlefield for example. It was entirely possible for ADHD to play the entire match and not get grabbed once. I can say that confidently without a doubt. He would have to work harder than usual, but he certainly could have avoided getting grabbed.
Take M2K's set with Meep. Look at the match where he got destroyed. Compare it to the match where he camps him out and wins. Now, imagine if he played like that for the match he lost. Do you think the result would have been the same, or would M2K have won that game? The way M2K played that last game, IMO, was a clear improvement over his earlier game. If you apply that improvement to EVERY game he plays, then Meep would have lost 2-0 or 3-0.
Now, imagine every player does that to IC's. They all "play gay" like M2K did. What would happen? Assuming the IC player and MK/other character player are about par skillwise, would it be safe to assume that IC's would not do nearly as well as they are now?
That's the way people SHOULD play. That not only demonstrates more accurate matchups across the board, it actually "tests" whether a character is broken or not. If you aren't using every tool available to play as "gay" as possible, then your matchups and views of a character are already flawed/skewed. Once you apply those gay things can you truly see where a character stands. Once those things are applied, I honestly don't think IC's are anywhere near broken.