re: Psycho sister in law

You Aggie frickers frick up every fricking thing that you fricking touch.

Yall could each wear a boxing glove if you fear getting hurt. You on the only arm that moves and him on his non steering hand.

Ask her when her style of education has ever worked?

If the point of her post was to help educate and bring people to understanding, she would have phrasied it differently or approached you directly.

Ask her what her motive is

The Appeasement policy is failure with more syllables. Disagreement without compromise is an acceptable solution if you have self control.

Just tell her you disagree. When she acts like a see-you-next-Tuesday, tell her those terms are acceptable.