Jag
Member
The ONLY thing you can say in such a situation is "holy shit, I'm an asshole, I apologize sincerely, and will work to never be like that again - fuck me"... or something along those lines.
Not if he never said it. You have 3 options. You can own it and apologize, you can deny it or you can say you don't remember it, which appears to be what he is attempting to say. The hashtag was bullshit though.
If someone accused me of something racist that I don't remember, I would probably say "I honestly don't remember. I don't think I would have said those things, but I'm sorry you think I did". Not much more you can say about something you don't remember.