Using "they" in place of preferred pronouns is objectionable in some circumstances, yes.

Using "they" is fine if you are describing a hypothetical scenario in which gender is unimportant.

Otherwise, failing to use preferred pronouns or acknowledging the role of gender in a situation actively disenfranchises and diminishes the real challenges faced by some individuals.

If your concern has to do with not wanting to acknowledge the gender of trans or gender-fluid individuals, I think it is reasonable to ask you to behave in a way that maximizes inclusion on the site, even if it is contrary to your personal values.

Using "they" in place of preferred pronouns is objectionable in some circumstances, yes.

Also, failing to use “they” as a preferred pronoun is objectionable.

Using "they" is fine if you are describing a hypothetical scenario in which gender is unimportant.

Otherwise, failing to use preferred pronouns or acknowledging the role of gender in a situation actively disenfranchises and diminishes the real challenges faced by some individuals.

This site, like all organizations and communities, prioritizes certain values over others. I think it is reasonable to prioritize inclusion highly - i.e., it seems reasonable to ask you to behave in a way that maximizes inclusion even if that behavior is contrary to your personal values.