Eating tinted eggs was a Jewish custom for Lag B'Omer since the histalkus of Rabbi Shimon Bar Yochai. When non-Jews adopted the practice for their "yom eidam', many Jews abandoned the minhog.
Don't miss this fascinating explanation about eating colored eggs on Lag B'Omer by Rabbi Levi Yitzchok Garelick. Did The Rebbe eat colored eggs on Lag B'Omer? Click here to learn more.