I wasn't around for Reagan, but I was a freshman in HS for the first GWB election and in college for the second. I distinctly remember being called a racist by a liberal friend in HS around that time as we debated politics (he apologized profusely the next day and we were friends for 4 years) and a murderer by a sobbing girl I had never met while watching the election returns in 2004 when she found out I voted for Bush. So yes, I'm familiar with the hyperbolic hatred of Bush from that era. It was ridiculous no matter how you felt about his policies.

When I say that I have what you would call Trump derangement syndrome, it's not because I hate his policies or even because he's a horrible human being. I disagree with him on most things, in some cases because my opinions have changed since I was a college freshman (mainly social issues and climate change) and in some cases because they haven't (foreign policy and fiscal issues). But the reason that I view him fundamentally differently from every politician who came before him is his willingness to completely disregard the truth on everything from the number of attendees at his inauguration to the outcome of the election. He also praised dictators at every opportunity, sought election help from Russia, broke countless norms of how our democracy has worked for generations, and used his office for personal gain in a way that puts all previous corrupt politicians to shame, along with a list of other actions that I could spend hours rehashing (I'll be happy to list these things out in detail if you want to get into them, but we're going to disagree). You mentioned below that he faced unprecedented corruption from the media, bureaucracy, Democrats, and Republicans. I'd argue that he was actually the unprecedentedly corrupt one and that it was the resistance that he got from those four entities that managed to keep our democracy alive long enough for him to get voted out of office. I'm not exaggerating when I say that I think Trump's election is the worst thing that has happened to America since the Civil War. That isn't because of his policies. It's because I viewed the events of Jan 6 as inevitable from the moment he was elected and attribute them directly to the lies that he told and norms that he violated from the first day of his campaign to his last day in office.

I think you also miss that point about others on this board who you would say have TDS, whether they're conservative, moderate, or liberal. While some might not express themselves artfully or politely, I don't think any of them see Trump as just another bad conservative like Romney, Bush, or Reagan. They might yell about policy in different ways, but there's also a recognition that he is fundamentally a threat to America in a way that generic conservatives before him were not.