Haven't seen this issue at all at our table. We are on the verge of starting our 4th group and we've had 1 half-orc. So far, all races have been available in all games, so there's no biases.
For us, it's been the feat from humans that has attracted the most interest.
Human - 14 (barbarian, bard, cleric, druid, fighterx2, monk, paladin, ranger/rogue, sorceror, warlockx2, wizard, wizard/ranger)
Elf - 3 (cleric, monk, wizard)
Dwarf - 2 (fighterx2)
Half-Elf - 2 (druid, paladin)
Half-Orc - 1 (barbarian)
Halfling - 1 (bard)
Dragonborn - 1 (cleric)
Custom Race - 1 (rogue)