I don't think there was any need to tick you off unless you were doing silly things like throwing stones at the bird or making loud noises. We Singaporean photographers have to be more considerate of other people around us. Life is not just about photography and anyone else has a right to interact with your subject unless it happens to be something you paid for (e.g. XMM model shoot, if an uncle starts chatting to the model I'm sure all the people in the shoot would be irked and justifiably so). Often when I shoot cats, and passer-bys start stroking and playing with the cat as well, I don't mind. I'm happy when I see people enjoying the company of these beautiful creatures.
For all of the indignation that we see expressed online about photographers and other photographers (e.g. ladder gang la, this guy keep doing silly things that affects my shooting), I think we should all always try to be aware about our surroundings and how we affect other people around us. Maybe I am overgeneralizing but I've often encountered people, when shooting landscapes, that just walk into your frame without any consideration. I could probably be a little more forgiving if these were non photographers - but there he is, toting a camera with a UWA, knowing that you are probably using a UWA (at places like Punggol), and happily waltzing into your frame as a unwanted model. I usually ask the other person shooting in the direction where I'd be positioned if it's ok if I am in that spot for a while. If they say that I would be in their frame, I move to another place. Similarly, when I am shooting from a good vantage point full of tourists, and people want a shot next to the landmark (e.g. Merlion), I'd be more than happy to finish up my shot quickly and move aside.
There seems to be an unwritten mentality that all that matters is the photograph. Well, especially when you are shooting a common subject... You can always do it again another day. There's no need to get so worked up about one's hobby.. Otherwise you might as well find another one. A hobby is to relieve stress, not to add to it. So let's all enjoy the hobby (if you are indeed hobbyists), and be more gracious to one another. Cheers!