LOL...it's OK to be ignorant about music, but being so public about it is probably not a good idea.
If you don't think selling 40 million records, and having more consecutive gold and platinum records than any band after the Beatles and the Stones (including 24 gold, 14 platinum, and 3 multi-platinum albums) doing successful tour after successful tour, and being in both the Canadian and US Rock & Roll hall of fame doesn't constitute being "hugely popular"...well, see "LOL" above.
No one is saying Rush is bigger than, or comparing them to U2...most bands aren't as big as U2. So we can dispense with that strawman. Anyway, congrats...you can say you're a fan of the biggest rock band in the world. How tough that is!
Oh, and I live in Europe most of the year. There are plenty of Rush fans there. But you're right...it is a running gag.
Run along now.