Parents don't understand BLW

So our baby girl will be 6 months in 4 days. She's showing all signs of readiness for solids so we decided to try out BLW today.

My parents are staying with us for the week (they live out of state) and last night we were all talking about introducing solids. I suggested a whole strawberry and they were incredulous, saying "no, she'll choke on the seeds" and "it has to be mashed." And today I tried giving her a piece of mandarin orange (she wasn't even bringing it to her mouth, just playing with it) and they were also telling me it was a choking hazard.

I keep trying to tell them I know what I'm doing, but they clearly have never heard of BLW and they think I'm crazy for not giving her mashed or completely soft foods as her first food.

This was mostly just a rant; I shouldn't have tried starting solids while they're here. I don't even know how to explain BLW to them.

Edit: Thank you so much for all the responses! Eventually I'm gonna get fed up and send them a bunch of info on baby led weaning lol