”Are there laws or policies that affect men that are being challenged by trans ideology?”
Everything in the Equality Act under the Protected Characteristics of Sex and Sexuality impacts on both men and women when “gender” and “gender identity” are incorrectly and illegally given precedence.
The nature and/or degree of impact might differ but the EA does not only protect, and is not intended to only protect, women and lesbians.
For example, in the NHS where “Single Sex Ward” really means “Single Gender Ward”: men might feel that the inclusion of a transman is to the detriment of their privacy and dignity and presents the risk of an accusation of inappropriate behaviour, when that behaviour would be acceptable or tolerated in a single-sex male setting.