I commute on a steel road bike. Sometimes I pass "roadies," sometimes they pass me. Sometimes I pass people on CitiBikes, sometimes they pass me. I just keep going at my pace. I don't see why some people need to make commuting a race. I have had some people pass me dangerously just to be in front, and others who are going slower will often pass me at a stop light, forcing me to pass them again and again. It's stupid and dangerous.
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1964 JRJ (Bob Jackson), 1973 Wes Mason, 1974 Raleigh Gran Sport, 1986 Schwinn High Sierra, 2000ish Colian (Colin Laing), 2011 Dick Chafe, 2013 Velo Orange Pass Hunter