This is definitely true, can see it anywhere I go. Out of maybe 10 gay friends we currently have, there is 1 which cares about himself on normal guy level. Rest have at home more beauty chemistry than my wife (or her friends), always perfect hair trim, new trendy clothing matching perfectly with each other, also obsession with taking perfect selfies (meaning 30 minute sessions for 1 photo).

Yes there are straight guys similarly obsessed with appearance/presentation (is the term 'metrosexual' still in?), but in far lower numbers