W-e-l-l, I don't think it matters if it's United's restroom or United's airplanes or any other carrier: airplane bathrooms and the aircraft itself are notorious harbingers of germs. And, the people using them can be really nasty. How do you flush a toilet and immediately exit the restroom without washing your hands? Happens a lot. My biggest pet peeve and gross-out moment is when a fellow passenger enters the restroom in her or his stocking feet and there's "liquid" all over the floor? Good grief - that's disgusting! but people do it ALL the time. Or, a FA who coughs in her or his hand and wants to serve me something? No thanks. Or, the fellow passengers who put their feet (with or without shoes) on the bulkhead, in the window, across an arm-rest, etc? When the FA passes out those hot towels, I use them to wipe down my tray, seat, and anything else. (And, I've taken a cue from a fellow traveler: she travels with the handy wipes and uses them to wipe down her seat area.)

I fly a lot, but I take measures, within my control, to reduce my exposure. There are no fool-proof methods and I won't always succeed. I do the best I can to prevent any unwanted infection (whether it's a cold virus or some type of bacteria) because I dislike being sick.

Even with COVID-19, I'm still flying. Nice to have reduced passenger traffic on the airplanes - works for me. :-)

Nota bene: About 15 years ago, I started using paper towels on doors and handles (on airplanes, public restrooms, public areas). I can't tell you how significantly that has reduced those low-grade viral infections I used to constantly get while flying/traveling. It was like night and day. I rarely get sick, now. Back then, I always had "something."