I would have preferred someone other than Biden. Not a bottom feeder like Trump, but someone better. We only get (2) choices - so our options are limited.
Again, maybe you missed my point, it's not about respecting the current President, it's about respecting the Office of the President.
Like it or not, our President is there for 4 years - maybe compare it to a captain of a wrestling team who you do not particularly like. You suck it up and support the team (which includes supporting the captain.) That's how you win. Fighting against the captain isn't productive and doesn't lead to success.