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Got a menu beyond burgers and fried appetizers? Do more of your volume at tables than the bar? Then you're not a bar, you're a restaurant that serves drinks, and since you're not a fancy one, fair game for families with kids. Deal with it.
Real bars, on the other hand, of the neighborhood variety, should be inviting only in way a cave mouth is. If a stroller won't fit through the door, it's a sign.
Of course, parents who take kids anyplace without regard for fellow patrons deserve censure. Going out has to include being willing to take kids outside if they start crying or otherwise disruptive. That's just common sense, or it was once upon a time.
As an aside, taking kids to eateries where "they can be kids" confuses the activity of eating with the activity of playing, which is already a hard distinction to make for a three-year old. Better to go to a restaurant and THEN the playground. And cheaper, usually.