Why Guildenstern feels indignant on the player?

I'm not exactly sure what you are looking for here. In Act 1 the player calls Rosencrantz and Guildenstern “fellow artists,” the Player lists the group’s dramatic specialties, which include sexual performances which Guildernstern feels is odd. The player says that Rosencrantz and Guildenstern may participate in the sexual performances for an extra fee.