Don't really see how a bloke saying a women who has children aren't his thing is insulting? Surely it is a personal preference? It's Like you saying bold divorced fat blokes over 50 aren't your thing, it is personal choice. At least he was honest with you and did not just ghost you like the others did with out telling you the truth first. I would be upfront and honest in your profile about having kids, if your young alot of blokes would not expect you to have them at least then they know before hand before talking to you and are less likely to ghost you when you tell them if you state you have them in your bio.
Generally my single female friends with kids have lots of very short relationships usually no more than around 3-4 months when the bloke has got what he wanted and the honeymoon period has worn off and then they can see what lyes ahead and then they are off like a shot.
Also if your young then there are plenty of women out there who haven't got kids so naturally men are going to want to date them as it can be quite alot of hassle dating someone with young kids, I know from personal experience, blokes don't want to be planning their life around someone else's childcare arrangements or having to plan date nights weeks in advance and then in my experience it usually gets cancelled because one of their kids has gone sick, or spending days out down pepper pig World when you have got the kids and then have to eat rubbish food down hungry horse as that is a child friendly place and then listen to kids screaming and crying, as a young bloke I would want someone free and single who can go for last min weekends away, date nights, holidays outside of term time, days out during the week, cycling long walks, adult only places, def wouldn't want to be playing step dad to someone else's kids that's for sure, then there are likely to be dramas with the ex, also the bloke will allways be second to your kids even though he treats you as his number 1, I wouldn't say that is unfair personally, although kids should allways come first to a single mum,
blended family's very rarely work out unfortunately as well, saying that all sounds harsh, but you may find someone who is interested but it will take alot more time and effort to find that someone who will stay for the long term.