I don't think you can call him an anomaly when he's been the dominant force of the republican party for the past decade. He has essentially become the republican party.
That aside, there's clearly a difference in the standards of the two parties, you can bring up anecdotes all day if you want to, the big picture still remains. Just look at this Senate run right now. We've spent the last few weeks talking about Graham Platner everyday. No one talks about Ken Paxton whose flaws are objectively orders of magnitudes worse.
With republicans it's baked in so no one cares. I understand that, it's a natural human response, but the logical disconnect is when we bake someone's flaws in without adjusting our perception of them to match. When Trump starts attacking people with 2nd grade insults at 2am, that's just Trump being Trump. And it is. But that's a f#%king problem, not an excuse to pretend it's not important.