I never noticed it until I finally committed to going fully vegetarian (and thus, stopped considering the non-veg options as possibilities if the veg option was unappealing...making unappealing vegetarian options a lot more noticeable). It doesn't happen everywhere, but I know what he/she is talking about.

In sandwich shops and some places with tacos and wraps, it's not uncommon to find just one dish that's properly vegetarian - often some mix of peppers, onions, squash, etc. I've always been puzzled by it, considering they tend to be somewhat polarizing vegetables. Something like beans, potatoes, rice, even corn - those things are much more broadly appealing, filling, and probably cheaper, too.

I also find that a lot of places/people don't know much about vegetarian cooking and they seem to think the only way to cure the blandness is to toss in peppers and onions.

> beans, potatoes, rice, even corn - those things are much more broadly appealing, filling

Far more bland and full of carbs, too, so they may be more polarizing than you think.