Beautiful, you don’t HAVE to forgive them. You just can’t ridicule them after leaving for being “tainted” or “evil” or whatever the acceptable word is now. Do not punish the behaviour you want to see.
“But they should’ve known sooner” and we should’ve known sooner that Destiel was never gonna meaningfully happen outside of queerbaiting, what’s your point?
“I never want them near me” that’s fine, but you do realize to insult them, YOU have to get near THEM, right? Wouldn’t it be more conducive to what you want to just leave each other alone?
“What if one of them tries to approach me?” Then you block them online, or you keep the conversation clinical and polite irl. You do NOT take time out of your day to berate them for their old views. Your mother raised you better than that.