It was Disney firing an employee who posted Tweets involving "jokes" about child molestation, AIDS victims, sexual abuse of women, and so on. Hell, Gunn wrote posts where he identified HIMSELF as a child molester. Not a great fit for a company that's known for family-friendly entertainment. It doesn't matter WHEN Gunn posted that stuff. The mind that would think such stuff was funny in the first place is the issue.
For crying out loud, think about it - would YOU post garbage like that in an attempt to be funny and get attention? And as for Roseanne continuing to be abrasive while working for Disney - well, Gunn left those awful tweets up while working for Disney. He didn't delete them until they were found out. I really don't see how Gunn is more excusable than Roseanne. I think she's got issues and posted a very dumb tweet and she should have kept her mouth shut, but at least she's not a perv.
Now, I'm exiting this conversation. Rationalize all you want about Disney selling out its once-wholesome image for a buck. Such obliviousness and ignorance of what Disney once stood for is something I will never understand from anyone who calls themselves a Disney fan.