Once I published a few math papers which contained new ideas in a new direction. This was closely related to my usual field of interest, but went somewhat beyond it. It was not obvious to me how many people in my field would be interested in it. Anyway I naturally wanted to promote my ideas to as broad community as possible.
I was invited to have a talk at a conference of a different community. There I met a person from my usual field. They said (if I understood correctly) that the fact that I visit this conference creates a competition. I feel they were unhappy about it.
Assuming that I understood the remark by my colleague correctly, was it a bad idea that I came to this conference? Is it unethical?
ADDED: I was told that in some scientific schools it is typical to consider some topics as belonging to the school, and others should not work on them. I am wondering how popular is this point of view.