Is it ok for a toddler to see breastfeeding?

So my 4 week old is exclusively breastfeeding, and my 2 year old son often sees it. I’ve never really given much thought to it since he’s never seemed to care about it. I had a relative over today and my baby needed to be fed at one point. I covered up so I wouldn’t make my relative uncomfortable. They asked if I normally covered up while feeding around the house since I have a toddler around. I said of course not, I’m at home so why should I? They then went on to say that’s super inappropriate, especially since he’s a little boy. I felt super awkward and uncomfortable so I changed the subject, but now I’m second guessing everything I’ve been doing.

I have a lot of anxiety about doing anything wrong with my children, so I can’t stop thinking about if I’m accidentally making him uncomfortable or “messing him up” (relatives words not mine). Is it ok for toddlers and older kids to see breastfeeding?

Edit: thank you for all the kind comments! The response has been overwhelmingly clear, it’s perfectly natural and normal for him to see. That’s what I had always assumed, but their comments had me second guessing myself unfortunately (thanks postpartum anxiety 😅). My husband and I have decided that relative is not welcome back for sexualizing not only me, but also my son. I’ve read through every comment and appreciate all the love and support! 🩵