There is nothing wrong with not wanting to party, i sometimes, after spending 4-5hrs static i want some time off to do my own things, now thats my thing. There are players who rather not deal with inexperienced players, players wanting to do things that would be a real time sink, an example would be i shout for specific leve, like "Dunesfolk, Eggs, and Ranine ONLY", now random people might join me, do these specific ones i mention and would want to do the other 5 random ones they picked up , which i may not have time for and dont want to deal with.
Some players choose to ignore all these together and enjoy game in their leisure. Soloers can play however they want as long as they don't affect the party play like petition to make the contents easier, - which is not in this case.