Maybe I interpreted incorrectly, but when I see “Just go sit at the bar!” it comes off as “you are solo so you should not take up a table”. Maybe because I have been told that at concerts in locations where you can purchase tickets for tables or the bar and have had people - who bought tickets AFTER me - fuss that a single person was taking up a place at a table.
It’s hard to tell tone on the internet, so we tend to read things in the frame of our experiences. If you have been made to feel less-than and that you are only entitled to a barstool because you’re solo, it tends to make your blood boil whenever you see it written “Just get a stool at the bar.”