Dude. He was the first president in US history to not hand over power peacefully when voted out of office. He orchestrated an unsuccessful coup, albeit with a bunch of idiots, to keep power. This will be the blueprint (claim fraud, sue, try to seize ballots or overturn states, etc.) going forward for all future losing GOP candidates in elections that don't go their way. He literally tried to get my vote and the results of my state's voters thrown out (I live in Milwaukee County, WI) with a group of fake electors. He appointed SC justices who have made life worse or at least more complicated for people whom I love. His acolytes in state and local government have directly put my job under ridiculous scrutiny that wasn't there before, and I have to endure slurs from his followers that I am a "groomer" because of the career that I have proudly done for over 20 years. I have "lost" family members who've more or less cut me and my wife out of their lives due to our not pledging total fealty to his agenda. I lost another family member to COVID, who despite being older with a compromised respiratory and immune system, felt it was a show of patriotism and loyalty to not get vaxxed or seek medical attention until it was too late.
I could go on, but suffice it to say, I, along with many, many others like me, indeed have a personal grudge against him.