Not necessarily. Individual expression of TAS2Rs is genetically determined and varies considerably[1]; and so the perceived bitterness of sinigrin-containing vegetables like cabbage (B. oleracea) differs from person to person [2,3].

[1] http://chemse.oxfordjournals.org/content/35/2/157.full

[2] http://www.nature.com/news/2006/060918/full/news060918-1.htm...

[3] http://tools.lifetechnologies.com/content/sfs/manuals/qPCR_l...