Yes. Trump did mock a reporter's disability: see for yourself https://www.youtube.com/watch?v=PX9re03QnUA

Whether or not he "personally" was involved is irrelevant. He was a principal in the business. It happened on his watch. He was accountable — that's why he was charged.

Trump absolutely encouraged his supporters to commit violence, urging them to "knock the crap" out of protesters and promising to pay their legal fees:
https://www.youtube.com/watch?v=WzYv5foyAS8

Trump did insult a Gold Star family, feeding anti-Muslim bigotry by suggesting that because Ghazala Khan was standing beside her husband ,who was speaking, that she was somehow prevented from speaking:

“[L]ook at his wife, she was standing there. She had nothing to say.  She probably, maybe she wasn’t allowed to have anything to say. You tell me,” Trump continued. “But a plenty of people have written that. She was extremely quiet, and it looked like she had nothing to say. A lot of people have said that.”