Sorry Lukas. I respect your opinion, truly. However, it is imperative to get the "language of the descriptions" right. Sapir-Whorf is valid and it does matter; the language we use to describe our world.
Accepting veiled insults does no good for anyone. If you do not perceive the insult from your perspective then that implies you can thank those who went before you and did such an amazing job of refining the limited tolerance and acceptance you enjoy today.
I believe Rosie has hit it on the head. If Lifestyle is a euphemism for same gendered sex, then say so. Hiding behind a term, to incorporate non acceptance into one's communication is something that many of us have learned to recognize. We have paid a price for it, perhaps other than you have, or may be aware of.
I once had a uni acquaintance say, "I don't care who is gay as long as they don't hit on me." Yeah. Right. That is such a display of tolerance and acceptance. No. No it isn't.
We are the ones who bear the brunt of the discrimination, the intolerance, the bigotry. We are the ones who have to be strong enough, and yes - brave enough to call it what it is. Explaining the insult, explaining why it is an insult, and redirecting people to the language and the concepts that are inclusive is a vital part of activism.
Yes, you are young. That is a glorious thing. However, the responsibility of being gay falls to all of us.
Some of us will be more "activist" in our interactions with the world, and that is as it should be. If the gays at Stonewall hadn't said enough, we very well may still be locked in a world where this discussion couldn't take place.
I'll be brazen enough to say one more thing. It doesn't matter that someone outside the community finds no offense in the terms that many of us find offensive. What matters is that person has her or his awareness of the potential for insult heightened, and goes on to care about that.
Will we all (in this beautiful gay community) agree on these sorts of things? Of course not! We are humans first, and as such will never agree on many things... just like any other group with general interests yet very different personal perspectives.