reftex-label-ignored-macros-and-environments

reftex-label-ignored-macros-and-environments is a variable defined in `reftex-vars.el'.
Its value is

nil

Documentation:
List of macros and environments to be ignored when searching for labels.
The purpose is to ignore environments and macros that use keyval
style label=foo arguments, but the label has a different meaning
than a \label{foo}. Standard \label{...} definitions are never
ignored.

E.g., TikZ defines several macros/environments where [label=foo]
defines the label to be printed at some node or edge, but it's
not a label used for referencing.

Note that this feature is only supported if you are using AUCTeX
and the functions `TeX-current-macro' and
`LaTeX-current-environment' are bound. Also note that this
feature might slow down the reftex parsing process for large TeX
files.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.