People who say things like this usually either a) don’t understand what feminism actually aims for, b) don’t understand that male privilege exists so a true equality movement needs to focus predominantly on women, c) have misconceptions about feminism based on bad interactions with someone who identifies as a feminist, or d) some combination of the above.
I think the male privilege thing is usually what causes this line of thinking though. They have not lived as women so they see their male problems as The Main Problems and have no frame of reference for other people whose oppression-based problems are worse.