As suggested, use an Expression column to mask the error bar values. You can also using a Logical in a mask directly.
In the example below, there are two Points commands, one that only plots the points and the other that plots the points and an error bar.
The logical statement in the mask is ‘mod(v, skip)==0’, where skip is a slider that is set to integers from 1 to 10. This way you can interactively change the number of values you skip.
Does this help with your case?