So @Triingtotrain how was your trip?
My own experience:
I was racing in Marbella, as well. I am at the airport now about to head back to the USA after a week’s extra vacation in Spain post-race.
I was traveling solo this time, so I was eager to meet people on tours, at pubs, etc. Pretty much anybody English speaking I would go pester and have a chat. I had conversations with English, Scots, Irish, Swedes, Canadians, Germans, French, Latvians, Spanish, Moroccans, and other Americans.
US politics were literally never a problem, or even uncomfortable. I didn’t expect them to be, and they weren’t.
Anybody “professional” (hotel staff, shop keepers, taxi drivers, etc) didn’t seem to care at all, and politics was never broached. As it shouldn’t be in that setting. They were happy to take my money. I found the Spanish to be very welcoming and gracious hosts.
Those who I met on the street mostly wanted to talk about non political stuff – they were interested when I mentioned triathlon, we talked about where we were from, family, jobs, travel, good spots to eat/drink, etc. Just normal human conversations.
When politics did come up, people mostly wanted to complain about their own government, and I was interested to learn about their unique perspectives and problems. No surprise, we can all bond over the incompetence and corruption of our own governments 
When Trump came up we laughed and commiserated over what an oaf he is. Not a problem at all, if anything it served as common ground.
I might actually be more concerned about traveling abroad if I leaned more conservative or pro-Trump. I didn’t personally bump into anybody who shared that perspective, though I wasn’t exactly trying. My mostly-uninformed assumption is that the cohort of English speakers who travel abroad around Europe will skew left-leaning.
So yeah, it was a fantastic trip (except for the last half of the run, ooff…). I hope yours was similar!
lastlap