I haven't talked to my friends about it. Up here in New York state, Native American culture is so ingrained that children have modules on the Iroquois 7 Nations in school. From experience, there is little my friends hate more than being asked to talk about these things ("What do you think of the Chiefs logo?") just because of who they are, as if, "Let's ask the token Indian what he thinks." So I don't ask. I let them tell me. But we've never talked about football logos. But what they do tell me is that there are huge simmering resentments and anger about how they've been treated, are treated. Things are not copacetic. Bygones are not bygones. Even saying the term Indian is fine with them, but they'd much prefer something else. Just like they don't like Iroquois and would prefer their actual name, but there is no big stink over it.
So, given what I know without having any actual knowledge of how they feel, I would say most certainly they are offended by these logos. But I don't know for sure. If I asked, they'd probably just shrug it off and say, "Well, sure." Or, "of course." But they don't dwell on it (or do they?) As for the logos somehow being related to respect for the culture, I think the depiction is always of a fearsome savage warrior, most often caricatured (see old Chiefs logos, or Cleveland Indians). So it's stereotypical. No attempt to portray anything else but how they might use a tomahawk to chop off a white person's head.
You remember the littering ads from the 1970s? The crying Indian on the bluff overlooking a dirty highway? I think that was maybe the first time I ever saw an Indian portrayed as anything other than warlike and savage.