All the "girls are easier" "boys are easier" "boys grow up and leave you" etc are all a load of rubbish. It's not dependent on what sex a child is it just depends on the individual. Some girls are easy some boys are easy some girls are difficult some boys are difficult. Some women are close with their mothers some aren't. Some men grow up, go off and have little contact with their Mothers, some remain very close and see them often. Nothing at all to do with being male or female so don't worry about all that.
I have noticed since having my second boy (I've got a big age gap) that people say the daftest things when your pregnant and after the babies born, I think part of it is just small talk trying to think of something to say, some of it is projecting their experience onto you and some of it is to try and be funny.
I have 2 boys, and a big age gap, my eldest is an adult and is still very much involved in the family. When people talk about boys being x, y and z they are making a generalisation, they have no idea how YOUR boys will behave.
I've had some weird comments, I used to get upset but now my stock response is just to laugh and say oh I know. Then get on with my day.
My adult son still gives me hugs, tells me he loves me, fusses over the little one, yea he's doing his own think but good he should be isn't that what we want for our children ti be independent? My niece on the other hand who is the same age is horrible to her mum, moody, entitled, has moved to the other side of the country. People are all different, our genetics, experiences growing up and the environment we grow up in determines how we are not our sex.
you'll be fine, you enjoy your boys and sod everyone else :)