Is it weird to sunbathe topless in front of your family?

I was sunbathing topless in my back garden yesterday and my mum told me to cover up because it was inappropriate, but she never had a problem with me being topless when we've been on holiday abroad. Our garden is well covered so no neighbours can see, so why is it a big deal?
Updates
+1 y
Yw and thank you, it's cooled down a lot in the UK now so it's not really an issue anymore anyway lol
Is it weird to sunbathe topless in front of your family?
Post Opinion