It's fair to expect people to pay attention to political issues that can affect them.

It's not fair to expect everyone to be intimately aware of every political gaffe, and instantly make the connection when you repeat it so they know not to reply to the comment seriously -- as the original comment was doing.

FFS, just put it in quotes so people know you're quoting someone. (Or if it's not a direct quote, mention that it's from the mentality of the person you're mocking.) Is that so hard? Is it so important that you feel special as someone who knows about that incident that you just have to provoke a confused flamewar?