I have been bullied, too. I never bullied in response. That’s the glory of being human. As Viktor Frankl says — the last of the human freedoms is the ability to choose one’s behavior regardless of circumstance.
Seems the older I get, the less tolerance I have for rudeness, too.
Interesting note, though — of all the bullies, trolls and rude people I’ve run across, the worst are always those who use a “nickname” and some random icon instead of their real name and photo. Masks, as you say.