I think it's because I'm never sure what to do with it.
There are so many pitfalls with red:
Red + Green = Holiday
Red + Purple = Red Hat Ladies
Red + Black = Vampire
Red + Pink = Valentine
I think the trick to red and I could be wrong, but my thought is it to pair it neutrals - like charcoal gray, smokey quartz, earthy browns (like wood) and creams. And then throw in several bright colors like these:
(Images from Pinterest - sorry, they weren't attributed.)
Red + Teal + Yellow + Green
Red + Orange + Red + Purple
Red + Teal + Orange + Purple
I've been looking through images of bohemian styles and Indian cultures and how they pair red with other colors. Layer on textures and fibers to give red a rich backdrop. I also like the idea of mixing patterns like floral with geometric designs. Several necklaces or bracelets paired together offer a bolder statement that are so in for this summer. Chain and silk in varying lengths are an easy way to add layers with several larger pendants.
Hopefully this will give you some inspiration for playing around with bolder colors. I know I'm looking forward to creating jewelry inspired by summer's trendier styles.
Poppies and other red beads can found in my Etsy shop.