That was me. I'm tourist clump avoidant, but I'll do it if I "must".
To me, a tourist and a traveller may see some of the same sites, but differently.
Even as I start in on this very mild whine, I'll say 'some of my best friends are tourists'. Or now they are, as it's easier at advancing age with mixed health.
To knock myself, maybe it's that I like control of what I am going to see, not to mention how fast I move whether speedily or involved in what I am seeing - and I hate being herded. Once in a while it's ok, going through the rooms in the papal palace in Pienza with a german speaking guide, the german way too fast for me but slightly familiar and was gibberish to my husband - but he got us there. That tour was fine, and I've read a lot more about that town and Andrea Piccolomini since. Small tours can be really good. Small tours can also be horrible.
So maybe I have control issues.