Oh it definitely can be both, but we are talking about this specific instance; not her career experience as a whole. I find it dubious at best that Marvel Studios would not hire someone based on their sexual preferences. They have targeted in general good actors/fits for roles.
I find it far more likely and probable that Stewart was never asked to be in an MCU film because her talent is non existent; and I also find it more likely she brings it up to drum up interest in herself for a role and bring her name into the limelight given she has a big budget film set to release in the November time frame.
Publicity is always good in Hollywood, no?
@tuhu to reply as well to your comment…she is not wrong that doing so is not ok. I am questioning the validity of her statement that someone from Marvel Studios did so to her. Just because her stating something that is right, doesn’t mean she also cannot be lying about it having been done to her.
I will say this is not an absolute. It is true in most situations, but there are career choices and fields where PDA is frowned upon and rightfully so. Service members are specifically instructed that PDA while in uniform is strictly prohibited. That is not about gender or sexuality - it is for all service members while in uniform. So the statement is true in a general sense, but not an absolute.