What’s up with people wanting to feed kids sugar?

Like am I missing something? My daughter’s only 14 months old and my mom gave me such a hard time the other day about not feeding my toddler cake. Then today my FIL tried to explain to me why I should feed her sugar and when I kept saying no then he was like “oh she’s going to love going to papas house with all the cookies and sweets”. And then proceeded to warn me from being “overbearing”

So yeah, am I being overbearing or reasonable? I just don’t get it