I wouldn't worry too much. Some love GRP for the ease of creating new hull designs and the smooth slick look, others like Alu regardless of the slightly rougher look. Some have brand loyalty to companies they know and love, others try new things. The world would be a dull place if we were all the same.
Humber, Ribcraft, Redbay, Osprey etc are all cracking brands with brilliant proven products. Highfield are a relative newcomer using a different material and producing greater volumes of products (and made in the Far East). They are always going to have doubters, don't sweat it. If you love your boat (and judging by your posts you do), that's all that matters.