This idea seems to be getting a lot of traction in SJW circles in the past year. You'd almost say it's "trending", as ideas go. Yeah, apparently it's "problematic" for men to be interested in or attracted to lesbians, even if they're lesbians these men will never meet and never interact with. The mere fact that it happens at all is "problematic". Of course, in typical SJW fashion, we can't ever specify whose problem that is, or what effect the problem has, or how that problem could be resolved, or even the nature of the problem itself. It's just problematic.
Because, you know, it's such an oppressive thought that a man could be attracted to a woman, or two. The fact that billions of years of evolution have us biologically wired to react to women is irrelevant. On the other hand, if women are attracted to women, that's okay and is perfectly natural.
TL;DR- it's your average SJW hypocrisy. You're allowed to be whatever you want to be, unless you're a cishet male.