Texan here. The Eastern District of Texas is a federal court and patents are federal law. The court is physically located in Texas but Texas state policy does not influence it.
The state, and especially that part of the state within that federal court district, being generally friendly to one type of party or another has to do with more than state laws. It has to do with public perception, legal specializations in that court district, and more. The juries are selected from that public and local attorneys in a district known for patent trolling will likely specialize in patent trolling cases.