I can see where you are coming from, but everyone should do what they want. What they think is appropriate. What they are comfortable with. I wouldn't describe what Tatiana describes doing as having a go- simply asking questions and giving an opinion. No more having a go than having Welsh in public is " forcing Welsh down people's throats". Good for Tatiana, I say!
I wouldn't do it myself, or say that to people, but that is a lack of interest on my part rather than worrying about their feelings or thinking that I shouldn't. But as I also say, I wouldn't make sure of starting every conversation in Welsh myself. I'm bilingual, I'm now happy to use either. I'm not going to go out of my way to speak Welsh, I'm not going to make a point of speaking Welsh any more than I will go out of my way to speak English or make a point of speaking English- I just speak Welsh as and when. Start a conversation in Welsh when - well, when I start a conversation in Welsh. And I seem to speak a fair bit if it, with people I know and people I don't, from what I can judge, knowing what I do about Wales.
But each to their own. What Tatiana is doing and saying sounds fine by me!