“But they did it too!” will not fly with me as a valid defense coming from an adult person. Your behaviour is your own responsibility. If you disagree with something, either respond in a polite manner or downvote and move on. Do not accuse others, either individuals or groups, of having a mental deficiency, brain damage, or aberration; and the fact that you would try to minimize what you said shows that you understand why I have an issue with it.

Be nice, or leave.