So, if a restaurant owner had a shopful of racist diners,and a black family walked in, he'd be quite within his rights to tell them to go away so as not to 'offend' his white customers??
And nobody here is talking about smelly nappies. I certainly wouldn't want baby poo wafting around me while I ate. Be reasonable.
Actually, a restaurant owner or any other proprietor would be breaking the law if he/she chased a nursing mum away. Even if the entire restaurant complained about her.