I see the same with my DD who has a boyfriend. Living together 3 or 4 years now. He comes from a home where he had a single mother and a brother. The mother made them do their fair share of chores, as she didn't want them sitting idle, or thinking the woman should do everything.
Yet, my DD still does almost everything around the house. He will do/has done a little bit of DIY, but will usually get someone do do stuff for him - like a mate or a male relative. DD, despite being a professional in a good job, and something of a feminist, still does the lion's share of the housework!
Even though she said hell will freeze over before she does all the housework, she still does (most of) it! It's almost like these men (young and old and in between) have an inbuilt mentality that housework is 'womans work' and they will not do 'womans work.' Yep, even the young ones.
It makes me mad when women say (and I do it myself,) 'it's easier and quicker for me to just do it.' Coz that's how they GET you! They give lacklustre performances with housework, so you feel you may as well do it yourself!
DD has fallen into this trap too 'oh well I do it quicker and better!' SO her boyfriend gets away with sitting on his arse while she does everything. He will cook about a third of the time but she does everything else.
My other DD lives alone, ergo does nothing for any man luckily!
I fear for my DD, that that they'll end up as a domestic servant when/if they have kids, and they will end up doing everything, while he sits on his arse, or gallivants about spending time away from the home doing various 'man' hobbies.
I genuinely think it's the mentality of men. Purely anecdotal I know, but I don't know, and have NEVER known one single man who does more housework/household chores than the woman. Even the ones who live alone, either live in a shit tip OR they hire a cleaner.
Most men don't live alone because they want to, it's often because they're forced to/have no choice, and so the housework is unlikely to be done well - if at all. And if it IS done, it will be a cleaner or some female relative doing it.