I don't bother to drop them any more unless it's an interval I was planning on doing anyway. If they're inches from my wheel I'll ask them to move back. If they're a few feet or more away and riding sensibly then it doesn't really bother me, though I would always prefer they ask or at least say hello before doing it. Context is important - if you're on roads with plenty of cyclists then it's fairly normal behaviour, but if you're in the middle of nowhere and riding along just the 2 of you it's pretty weird not to say something! I actually get much more bothered when somebody decides to pull in right in front of me - that's much more presumptuous as it messes with whatever workout I was planning. It's also more dangerous for me - when a rider crashes into another one from behind the rider in front is generally fine.
I rarely wheel suck myself as if I'm riding solo I generally prefer to stick to my own plan. Did have an exception last month when I was riding with friends in the Italian Alps and a rider came past us on a climb in head to toe Katusha kit (right down to team bike, gloves, socks, shoes, etc). Assumed it was a pro and since there was only about 3-4km to the summit I decided to follow and see if I could hang on to the top. Kept a respectful distance of about a bike length back, exchanged a few pleasantries in broken Italian including a "grazie!" at the top. Had a look on Strava Flyby later and turned out it was Ian Boswell, I'm 100% sure he was riding zone 2/3 and could have dropped me like a stone whenever he wanted but hope he didn't mind the company on what otherwise looked like a long and lonely training ride!
I rarely wheel suck myself as if I'm riding solo I generally prefer to stick to my own plan. Did have an exception last month when I was riding with friends in the Italian Alps and a rider came past us on a climb in head to toe Katusha kit (right down to team bike, gloves, socks, shoes, etc). Assumed it was a pro and since there was only about 3-4km to the summit I decided to follow and see if I could hang on to the top. Kept a respectful distance of about a bike length back, exchanged a few pleasantries in broken Italian including a "grazie!" at the top. Had a look on Strava Flyby later and turned out it was Ian Boswell, I'm 100% sure he was riding zone 2/3 and could have dropped me like a stone whenever he wanted but hope he didn't mind the company on what otherwise looked like a long and lonely training ride!