Are Amoretto Sours weaker than a regular mixed drink?

When I go out I vary between beer or some vodka mixed drink but I always enjoy amoretto sours because of the taste but this one time at the bar I had them most of the night and the bartender asked me “hey are these for you?” So I replied yes and he said “you know these aren’t that strong right?” And it had me questioning myself because I usually get a solid buzz or decently drunk just drinking them. Are they really not that strong in comparison?