I'd be fine with it, as long as the comment(s) were positive. It's not nice when people make derisive comments about it, or ask questions about every little thing (I've had "why would you want something that's meant to taste like a burger - if you want a burger just eat the burger!" and other such comments from strangers looking at my shopping trolley.)
Also, related - a few days ago I was loading some reduced vegan ready meals into my cart, and another shopper stopped me to say "oh, I love those too!", which was fine, but she then continued "but make sure you take them out of those plastic tubs and put them in a ceramic dish in the oven. Plastic will give you cancer and microwaves will give you radiation poisoning." Like, I get that it was well-meaning (if a little batty) but maybe don't tell a total stranger that they're gonna get cancer?