This can be a drain on resources and increase LUN scan times. It also makes the GUI pane messy.
You can stop these from loading by disabling the following modules in ESXi 6.0 from either SSH or the DCUI
esxcfg-module -d fcoe
esxcfg-module -d bnx2fc
esxcfg-module -d bnx2i
After a reboot you will see that the Storage Adapters list much smaller.