It sounds like you have a Grenade or maybe a Steamroller to deal with. Those are personality types described in the article How To Deal With Difficult People. Your president is a bully, and no one would blame you if you quit entirely. If you do want to address the situation, though, the strategy is to confront the behavior and find out what's really behind it. It also helps to get support from others in a similar situation. I'd also recommend talking to the principal about how this is ruining the parent group and turning away potential volunteers. Check out the article for some tips on how to confront the bully, including language that will help. Good luck!
- Craig
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How To Deal With Difficult People: https:/classic.ptotoday.com//pto-today-articles/article/409-how-to-deal-with-difficult-people