Anything can "make others feel unwelcome" given enough determination to find so. Did you vote for Trump? You get the boot. Voted for Hillary? You get the boot too, there are Sanders supporters around! Ah, you like Sanders? You communist! Communists certainly can make people feel unwelcome, they did tons of scary stuff over 20th century. What, you don't like communism? Maybe you like capitalism then? You pig! You're making Marxists feel unwelcome! Off with your hea^H^H^Hjob!
Maybe you believe in God? Like, a Christian? That certainly will make a lot of folks feel unwelcome. But maybe you're an atheist instead? Ha, did you think you'd get out that easy? Of course you'll make somebody feel unwelcome. [1]
OK, this is all political stuff. Let's get so something nobody objects to. How about cheese? Do you like cheese? Do you, you filthy sexist[2]?!
If you try hard enough, you can see "feel unwelcome" in literally anything, and simple google search proves it's not even a bit of exaggeration.
[1] https://www.nytimes.com/2017/07/24/us/richard-dawkins-speech...
[2] https://www.peta.org/living/food/why-cheese-is-the-most-sexi...