Why is it offensive? How is it any different?
The difference is that women's oppression is lower on the pyramid.
Millenia of sexual violence, forced marriages, menstrual exclusion, domestic violence and coercion, mutilation, slavery, domestic drudgery, enforced childcare, unequal pay, medical inequalities, religious blame, disenfranchisement, disrespect, sex trafficking, exclusion from work and education, urinary leashes, discrimination, reproductive restrictions, honor killings, belittling of femininity, unequal inheritance rights, selective abortions/abandonments, proportional unrepresentation, restricted movements, harassment, sexualisation, infatalisation, powerlessness etc
don't count. Because women always come second.