Ignore them. Don't argue with them. Don't respond to them. If you must discuss them with others, do it in Personal Messages.

If you have gotten into unpleasant arguments in the past, re-read the old threads to (1) see how you contributed to the escalation of the rhetoric, (2) decide at what point you could have bowed out gracefully, and (3) see whether you could have interpreted another person's remarks in a more generous way.

If you're not part of the solution, you're part of the problem. (That is, you're one of the people that others shouldn't respond to.)