In this instance, it's that both sides are petty.
I can tell you why this isn't petty and a few things that *are* petty in opposition to Trump, but you said something silly in the next paragraph, so...
Maybe if Trump named this "Operation Warp Speed 2", history can repeat itself and it'll be another thing they initially claim to hate it and not trust it,
This is a very silly (one could almost say "petty") example given the fluidity of "partisanship" regarding the COVID vaccines from 2020-21.
Were lots of people skeptical of the rapidly produced vaccines? Of course. Did some liberals say "I don't know if I'm going to take a Trump vaccine."? We all know they did. Do we know of any significant numbers who ultimately didn't take it because it was a "Trump vaccine"? I certainly don't.
If there is *ONE* thing that Democrats will admit that was good about Trump I, it will be Operation "Warp Speed". (Even though any non-incompetent administration would have done the same thing: fund all pausible candidates to production and pledge to purchase certain amounts even if it fails [providing that they push into production ahead of approval].)
but then a Democratic successor will take over and say the ballroom is good, and everyone should embrace it, then conservatives can sour on it, and their liberal family members can disinvite them from Thanksgiving dinner over their refusal to embrace the ballroom.
That would be petty.
Why do I think the ballroom is stupid?
1. If your dinner requires a room that big, have a smaller dinner party. So pointless.
2. The whole idea of the rather modest nature of the "Executive Mansion" or "President's House" (as it was originally called) was that it was more suitable for a President of a republic than a king or potentate. We lose something when we imitate the decrepit aristocracies of Europe.
3. The project has bypassed all historical preservation and design procedures in the most extreme fashion.
4. The project is funded by oligarchs and without proper appropriation
5. It is ugly.
Now for somethings petty. There are all of those petty nicknames that are generally not permitted here (orange one, Drumpf, etc.) If you want something petty, how about renaming all of the pit toilets in the national parks as "Donald Trump John"s.
Please don't confuse my disdain for Trump's ugly, unnecessary, unauthorized, vanity project as mere pettiness because I disdain him as well.