Generally, I don't - but then again, I mostly spend a lot of my photography time using a big white lens around lots of other people using big white, black, or grey lenses...if anything, I'm barely in the middle of the pack for lens size - some are carting around 600mm F4s with 1.4x TCs on massive tripods...so my 300mm and 400mm lenses, or 200-500mm zoom, don't stand out much. The most common thing I run into are Canon shooters who go out of their way to ask me which lens I have - assuming a large white lens to be a Canon lens...when I note it's a Minolta APO lens, they think I'm shooting film...then I mention it's a Sony body (many don't realize the connection)...then they start talking about their general dislike of electronic viewfinders, to which I then have to note that mine has an OVF, not EVF. They're usually thoroughly confused by then, so when I show them my second camera body, a NEX, with a 55-210mm lens and a 1.7x external teleextender attached, plus a top-mounted EVF, they think I'm from another planet.
My birding gear - a Sony DSLR with Minolta 300mm F4 APO, plus 1.4x matched APO II TC (hood reversed and cover on, with pistol grip attached):
Backup camera - Sony NEX-5N, with EVF, 55-210mm lens, and 1.7x teleextender: