Depends on the user group and the context you're designing for. Only so-called "novice users" struggle with right click. Intermediate to advanced users are well versed in it. The former user group is dwindling by the day.
Be very careful about conflating the two issues. Usability studies have shown that users struggle with inappropriately labelled hamburger menus. Usability studies have also shown that users of intermediate to advanced skill do not struggle with right click. One is an issue regarding appropriate labelling and visual affordance, and the other is one of system and hardware affordances.
http://www.nngroup.com/articles/feature-richness-and-user-en...
This also falls under the "myth of the stupid user." http://infodesign.com.au/usabilityresources/articles/themyth...
Be very careful about conflating the two issues. Usability studies have shown that users struggle with inappropriately labelled hamburger menus. Usability studies have also shown that users of intermediate to advanced skill do not struggle with right click. One is an issue regarding appropriate labelling and visual affordance, and the other is one of system and hardware affordances.