Dang I wish I knew what Gord did - cause he spoke of this very problem you ask for advice about. Having played only one "gig" - the comical drumming pinch-hit at the Ramada C & W band night, I surely don't qualify as a musician who is accustomed to audiences.
Gord spoke of this in the first person on an album cover , in a bio I believe where he was quoted ( maybe the gatefold double-album in vinyl LP days of GG1 I think) and very roughly he said "playing in bars and nightclubc had its advantages and challenges; getting through the noise of rowdy patrons watching our national past-time - Hockey on the bar TV was a real challenge - so I'd tell a few off-colour jokes, and use the time to experiment on stuff I would never have played if the audience was really diggin' it and listening. I could test out new material, play covers, and when I could get their attention through the fracus , it was very gratifying.... enjoying seeing people get off on the music and my singing was great, and I made several contacts and colleagues on the audience - Ian & Sylvia , Peter Paul and Mary, and Ronni Hawkins. They picked songs of mine and recorded them before I was on vinyl; introduced me to infuential business people in the recording industry, it helped give me ahand-up in the business. PLaying at Steel's Tavern was actually like being on a Riverboat Saloon; done up just like one, larger audience, attentive, I got playing reular there monthly. I was able to refine a set of songs the audience got off on , anticipating my first album's material.
This is all I recall from memory, Steele's Tavern versus what may in fact have been the "Riverboat" Sloon I think was actually two different places. A friend of mine while working through college in a lumberyard said, having grown-up in Toronto, where STeele's Tavern was, that he drank a few times with Gordon between sets, and said "oh man taht Lightfoot was a DRUNK.... man he could put it away...." . That saddened me, I knew Gordon had experienced his battle with the bottle, but to say it in such a pejorati ve sense caused me to really take umbrage as a die-hard fan..
Bottom line I believe is Gord's challenge, pertinent to your question as to what to do when the noise is irritating and it confuses you.... - recall him saying one more thing that kind of sums it up...roughly again:." while they watched hockey, yelling and throwing things, talking loudly, never even knowing I was there at times, I figured out I could use it to my advantage by considering it "paid rehearsal" . No one (for the most part) was listening enough to criticize, and I could try anything I wanted, build my repertoire, and get paid for it." - not bad thinking i 'spect. Hope this helps from an unqualified source Podunk
~geo steve